The contribution of multi-channel pion-pion scattering to the final states of ϒ-meson family decaysYu.S. Surovtsev, P. Bydžovský, T. Gutsche, R. Kamiński, V.E. Lyubovitskij and M. NagyEPJ Web of Conferences, 81 (2014) 05028DOI: https://doi.org/10.1051/epjconf/20148105028